Many thanks, Hans, as that seems to have done the trick!

On 9 Aug 2015, at 11:59, Hans Hagen <pragma@wxs.nl> wrote:

On 8/9/2015 2:42 AM, talazem@fastmail.fm wrote:
Hello,

I currently use the following to define my even and odd page headers.

—————
\startsetups[header]
  {\doifoddpageelse
   {\getmarking[section]}
   {\getmarking[chapter]}
}
  \doiftextelse
   {\getmarking[chapter]}
\stopsetups
—————

The problem is that some of my ‘section’s are not sections, but ‘subject’s (because I don’t want that section heading to appear in the TOC). As a result, my header is blank on the ‘subject’ pages.

Is it possible to define getmarking to take either a section or a subject, somehow? Listing them both separated by a coma (\getmarking[section,subject]) produced no result. I also tried:
—————
  {\doifoddpageelse
   {\getmarking[section]}
  {\getmarking[subject]}
   {\getmarking[chapter]}
—————
…but that caused the subject and the chapter to both be printed in the header.

Many thanks for any help.

\setupheadertexts[{\getmarking[section]}]
\definehead[suction][section][number=no]

\starttext
   \placelist[section] \page
   \section{foo} \page
   \suction{bar} \page
\stoptext

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